I really love the Smart Drill function! I love being able to confidently answer one question at a time, get my score/stats and review where my logic erred before moving on to the next question.

I think a way to make the function even better is if we were able to program custom question sets for Smart Drills. For example, I have been drilling Causal Reasoning and Necessary Assumptions recently, so I would like to be able to select CausR and NA questions in my Smart Drill. For me, working in this way allows me to test my understanding of problems and the question's logic better, as well as potential strategies for answering different question types quicker than, say, a traditional 5 question drill would (and I don't have to reset after those 5 questions are done).

Of course if there's already a way to do this, I'm sure I look silly, but I think this would be a very useful implementation!